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Place the chopped veggies a large non-reactive pot or bowl. Pour 1/4 cup kosher salt over the vegetables and enough water to cover them. Let the vegetables soak in the salt water for at least 6 hours or overnight.
To prepare the jars, place the spices into each of the jars, reserving the garlic and olive oil until after the brine is added. (I like to make some jars hot and some mild by adding/omitting the red chili flakes).
Thoroughly rinse and drain the vegetables before dividing them up between the jars. Pack the vegetables in as tightly as you can. Place the garlic each jar.
To make the brine: Bring the water, vinegar and salt to a boil. Pour the boiling brine over the vegetables leaving a little more than 1/2 inch headspace from the top. Pour the olive oil over the top. Wipe the rims with a wet paper towel and seal the jars.
If you plan on using the giardiniera within two weeks let the jars sit at room temperature for a day or two and then transfer them to the fridge. The flavor only gets better with time so wait at least 2-3 days before eating it. Will keep refrigerated for 2 weeks.
If you're canning the giardiniera for long-term storage, seal the jars with the lids and rims and prepare a boiling water bath. Boil the jars for 10 minutes. Carefully remove the jars and let them sit undisturbed for 24 hours before moving them.If processed in the water bath, the giardiniera is best consumed within 6 months but will keep for at least a year.**IMPORTANT NOTE: If you're canning the jars for long-term storage it is critical to be sure you thoroughly wipe the rims of the jars to ensure no oil residue is on them, otherwise they will not seal properly. Alternatively, you can omit the oil during canning and add it later to your giardiniera when you open the jar.